Whenever I move my mouse it has a delay that acts like aim acceleration. If I flick it a lot, it starts out slow, but then spins really fast for a long time. If I move my mouse, then press a key, it moves my camera around, THEN does whatever the key I pressed does. For instance, if I move my mouse and press space at the exact same time, I would jump after my mouse stops moving.
Attached below are two videos. You can hear me press down my spacebar, only for my player to jump after my mouse stops moving.
https://streamable.com/0kseih
https://streamable.com/313s7a
Quick note: My mouse is fine in every other game I play, and in the BFV menus I have no issues.